The mixing of races isn’t new, just more talked about in places where it hasn’t been acceptable in the past. Regardless, I suspect it will take more than 3 generations. You should know that some people bristle when complexions are described as caramel, toffee, coffee, etc. because those terms equate skin tone with food, and there can be underlying connotations with that. As for becoming queer, the number of people who publicly identify as LGBTQ may go up as societal acceptance increases, but the overall percentage of the population is unlikely to change much. I just hope that the world keeps trending toward more acceptance of others, regardless of what makes them who they are.